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The Water Cooler
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Five Are Officially Finished
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<blockquote data-quote="thor447" data-source="post: 3866491" data-attributes="member: 24867"><p>The rubies are synthetic. On the Mohs hardness scale, diamonds are at the very top with a rating of 10. Rubies, which are sapphires, are 2nd hardest at number 9. It is still much harder than the stainless steel which it acts as the bearing surface for. The rubies are intricately shaped, have very tiny holes drilled through them, etc. All of the manufacturing of these rubies, including shaping them, drilling, etc. has to be done using diamond tools. The rubies themselves are fairly inexpensive to manufacture. It would be unbelievably more expensive to use a diamond for the same task, and since the ruby is harder than the stainless steel pivots which it is used for (Mohs of 5-6.5 depending on the specific alloy), and harder than the brass or any other alloy are used in the main plates or bridges in which they are set, there’s really no need to use a diamond. The ruby will never wear out from a stainless steel pivot, but rather the other way around. They will wear out pivots on watches, and themselves be in perfect condition. The only downside against them is that they are so hard in fact that they can shatter. You rarely ever see that though, and most of the time when it does happen its during installation or end shake adjustment, not during its life inside the watch.</p></blockquote><p></p>
[QUOTE="thor447, post: 3866491, member: 24867"] The rubies are synthetic. On the Mohs hardness scale, diamonds are at the very top with a rating of 10. Rubies, which are sapphires, are 2nd hardest at number 9. It is still much harder than the stainless steel which it acts as the bearing surface for. The rubies are intricately shaped, have very tiny holes drilled through them, etc. All of the manufacturing of these rubies, including shaping them, drilling, etc. has to be done using diamond tools. The rubies themselves are fairly inexpensive to manufacture. It would be unbelievably more expensive to use a diamond for the same task, and since the ruby is harder than the stainless steel pivots which it is used for (Mohs of 5-6.5 depending on the specific alloy), and harder than the brass or any other alloy are used in the main plates or bridges in which they are set, there’s really no need to use a diamond. The ruby will never wear out from a stainless steel pivot, but rather the other way around. They will wear out pivots on watches, and themselves be in perfect condition. The only downside against them is that they are so hard in fact that they can shatter. You rarely ever see that though, and most of the time when it does happen its during installation or end shake adjustment, not during its life inside the watch. [/QUOTE]
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